The utility model discloses a mining water-collecting device, which comprises a water collector support, a water collector and an automatic water discharger. The water collector is inclinedly fixed to the water collector support. A plurality of drilling interfaces and an extraction pipe interface are fixedly arranged on the water collector. The lower end of the water collector is equipped with two water outlets and one of the water outlets is served as a standby water outlet. The water outlets of the water collector are connected with the automatic water discharger. By utilizing the mining water-collecting device, the burden of a gas extraction pipeline in the mining drainage process is greatly reduced and the extraction effect is also ensured. Meanwhile, the gas content in a coal seam is reduced as much as possible and the production safety is improved.